Add support for pkey_mprotect, pkey_alloc, pkey_free syscalls

* linux/32/syscallent.h: Add syscall entries for pkey_* calls.
* linux/64/syscallent.h: Likewise.
* linux/arm/syscallent.h: Likewise.
* linux/i386/syscallent.h: Likewise.
* linux/mips/syscallent-n32.h: Likewise.
* linux/mips/syscallent-n64.h: Likewise.
* linux/mips/syscallent-o32.h: Likewise.
* linux/x32/syscallent.h: Likewise.
* linux/x86_64/syscallent.h: Likewise.
* mem.c (do_mprotect): New function, common handler for mprotect and
pkey_mprotect.
(SYS_FUNC(mprotect)): Convert to wrapper around do_mprotect.
(SYS_FUNC(pkey_mprotect)): New function.
* xlat/pkey_access.in: New file.
* pkeys.c: New file containing implementation of pkey_alloc and
pkey_free.
* Makefile.am: Add it.
* NEWS: Mention this enhancement.
* tests/.gitignore: Add pkey_alloc, pkey_free, and pkey_mprotect.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add pkey_alloc.test, pkey_free.test, and
pkey_mprotect.test.
* tests/pkey_alloc.c: New file.
* tests/pkey_free.c: Likewise.
* tests/pkey_mprotect.c: Likewise.
* tests/pkey_alloc.test: New test.
* tests/pkey_free.test: Likewise.
* tests/pkey_mprotect.test: Likewise.

1 files changed, 15 insertions, 1 deletions

diff --git a/mem.c b/mem.c
index affc9355c..9b54486cc 100644
--- a/mem.c
+++ b/mem.c
@@ -182,15 +182,29 @@ SYS_FUNC(munmap)
 	return RVAL_DECODED;
 }
 
-SYS_FUNC(mprotect)
+static int
+do_mprotect(struct tcb *tcp, bool has_pkey)
 {
 	printaddr(tcp->u_arg[0]);
 	tprintf(", %lu, ", tcp->u_arg[1]);
 	printflags_long(mmap_prot, tcp->u_arg[2], "PROT_???");
 
+	if (has_pkey)
+		tprintf(", %d", (int) tcp->u_arg[3]);
+
 	return RVAL_DECODED;
 }
 
+SYS_FUNC(mprotect)
+{
+	return do_mprotect(tcp, false);
+}
+
+SYS_FUNC(pkey_mprotect)
+{
+	return do_mprotect(tcp, true);
+}
+
 #include "xlat/mremap_flags.h"
 
 SYS_FUNC(mremap)